JPH03186632A - Damping device for structure - Google Patents

Abstract

PURPOSE:To stabilize the performance as a damper and to improve the durability by sealing lead in a pressure tight hose in which a thin plate spring is disposed in parallel to a hose, and fitting both ends of a curved damper to the respective structures adapted to deform relatively. CONSTITUTION:When a relative displacement occurs between upper and lower structures in case of an earthquake, a damper A is curved, and the resistance force of lead 3 at the time of bending deformation is utilized as a damper so as to exhibit a damping effect. If a pressure tight hose is deformed unexpectedly, for example, twisted or the like, though the performance as a damper is not stable, the pressure tight hose 1 is deformed only in a fixed plane by a thin plate spring 2 and twisting and out-of-plane bending are restrained because the thin plate spring 2 is disposed in parallel to the hose in the pressure tight hose 1. The rigidity of the think plate spring 2 within a fixed plane is very little, and the resistance force when the hose 1 is bent is mainly dominated by lead 3. Since the lead 3 is sealed in the hose 1, no crack occurs, the bearing force is not lowered so as to improve the durability remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration damping device for a structure using lead as a damper material.

(Prior art) Conventionally, this type of vibration damping device uses a lead plug (
Both ends of a) are fixed to the upper structure (in the upper structure) and the lower structure (C) via mounting flanges (e
).

In the figure, (f) is the welded part of the lead plug.

(Problems to be Solved by the Invention) In the conventional vibration damping device, a special technique is required for welding the lead plug, and productivity is poor due to the lack of skilled workers.

Also, lead plugs are not very durable.

The present invention was proposed in view of the problems of the prior art, and its purpose is to take advantage of the properties of lead,
Another object of the present invention is to provide a vibration damping device for a structure using lead as a damper material with improved durability.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a vibration damping device for a structure according to the present invention includes a thin plate spring disposed inside a pressure hose in parallel with the hose, and a thin plate spring inside the pressure hose. It is constructed by bending a damper made by enclosing lead, and attaching both ends of the damper to each structure that causes relative deformation.

(Function) As described above, the present invention bends a damper constructed by enclosing lead in a pressure-resistant hose, and when bending deformation occurs in the damper due to relative displacement occurring in the upper structure at both ends. The resistive force of the lead acts as a damper, exerting a damping effect.

Since the pressure hose is provided with a thin plate spring parallel to the hose, the damper is constrained to deform within a certain plane, and the stiffness of the thin plate spring within this deformation direction is small. Therefore, unexpected deformation such as twisting of the damper does not occur, and the performance of the damper C is stabilized.

In addition, when lead is repeatedly deformed alone, cracks occur and grow due to repeated fatigue, leading to breakage, and as the cracks occur, the resistance also decreases, but in the present invention, lead is sealed in the pressure hose. Because of this, no cracks occur, and therefore no decrease in yield strength occurs, resulting in improved durability.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(1) is a pressure-resistant hose, for example, made of fluororesin.
(la) and outer 11 (lb) made of wire braided body
A thin plate spring (2) is enclosed in the inner N (la) in parallel with the hose (1), and the hose (1) is
) is sealed with lead (3) to form the damper cap.

The damper is curved into an inverted U-shape, and both ends are attached between the upper and lower structures as described below.

A lead-filled plug (4) is fitted to the end of the hose (1), a socket (5) and a sleeve (6) are fitted, and the socket (5) is screwed into the mounting member (7). has been done.

A nut (8) is screwed into the mounting member (7), and if a gap occurs in the pressure hose (1) for some reason, the mounting member (7) can be tightened using a lead-filled plug (4). ) to compress the lead (3) in the pressure hose (+) to eliminate voids.

The mounting members (7) at both ends of the damper 4
However, the mounting brackets (9) fixed to the upper and lower structures (Bl)
Fixed.

Since the illustrated embodiment is configured as described above, when relative displacement occurs between the upper and lower structures during an earthquake,
When the damper is bent, the resistance force of the lead (3) during bending deformation is used as a damper to exert a damping effect, but unplanned deformation may occur, such as the pressure hose (1) being twisted. If this occurs, the performance as a damper will be unstable, but in the above embodiment, the thin plate spring (2) is disposed in the pressure-resistant hose (1) in parallel with the hose (1), so the thin plate spring (2) 2) allows the pressure hose (1) to deform only within a certain plane, and is restrained from twisting or bending out of plane. The rigidity of the thin plate spring (2) within the certain plane is very small, and when the hose (1) bends and deforms, the resistance force due to lead (3) is dominant. Figure 7 shows the movement of the damper (4), and when a relative displacement occurs between the upper and lower structures, (
AI) (Ai) (Ai) (Ai)
(Move to the phantom position of A. (^,) was a straight part, but it became a curved part as shown in (Ail), and (
A2) was a curved part, but it became a straight part as shown in (Ail), and the resistance of the damper prisoner at this time was dominated by lead (3), and the straight part became a curved part. In other words, it is obtained by plastically deforming a curved portion into a straight portion.

Further, as described above, when lead is repeatedly deformed by itself, cracks occur and grow due to repeated fatigue, leading to breakage. In addition, as the crack grows, the resistance decreases, but in the above embodiment, lead (3) is sealed in the pressure hose (1). Since it is restrained, no cracks will occur, no reduction in yield strength will occur, and durability is significantly improved.

In the illustrated embodiment, the pressure hose (1) is a pressure hose composed of an outer layer made of a fluororesin and an inner layer made of a wire braided body. A rubber hose made of several layers of polymerized rubber may be used, and both have flexibility, and changes in volume within the hose relative to internal pressure can be almost ignored.

Further, the thin plate spring (2) may be sealed between the lead parts (3) (3) (see Fig. 5). The damper is curved by enclosing lead in a pressure-resistant hose placed parallel to the damper, and both ends of the damper are attached to each structure that undergoes relative deformation. The resistance force during bending deformation of the lead due to the curvature of the damper due to the relative displacement that occurs between the structures is used as a damper to exert a damping effect, and the thin plate spring allows the damper to maintain a constant level. Deforms only within the plane, providing stable damping performance.

Furthermore, since the lead is sealed and restrained within the pressure-resistant hose, durability is significantly improved without causing a decrease in proof strength.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional view of a damper used in the vibration damping device for structures according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a longitudinal sectional side view thereof, and Fig. 4 shows its installed state. A plan view showing,
FIG. 5 is a vertical sectional side view showing another embodiment of the damper;
6 and 7 are plan views showing the movement of the damper,
FIG. 8 is a side view showing a vibration damping device for a structure using a conventional lead damper. Prisoner...Dumper (81...Structure, (1)
...Pressure hose, (2)...Fi +Ii spring, (3)...Lead, (7)...Mounting member.

Claims (1)

[Claims] A thin plate spring is placed in a pressure-resistant hose parallel to the hose, a damper made of lead sealed in the hose is curved, and both ends of the damper are attached to each structure that causes relative deformation. A vibration damping device for a structure, which is characterized by: